A parametric study on the hydromechanical properties of claystone/bentonite mixtures
Mixtures of crushed excavated COx claystone and bentonite are considered as a potential backfill solution for the French disposal concept of radioactive waste. In the present work, the hydro-mechanical behaviour of claystone/sodium bentonite mixtures was experimentally investigated for various bento...
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| Format: | Article |
| Language: | English |
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EDP Sciences
2023-01-01
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| Series: | E3S Web of Conferences |
| Online Access: | https://www.e3s-conferences.org/articles/e3sconf/pdf/2023/19/e3sconf_unsat2023_19002.pdf |
| _version_ | 1797835334404276224 |
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| author | Tyri Danai Djeran-Maigre Irini Robinet Jean-Claude Zghondi Jad |
| author_facet | Tyri Danai Djeran-Maigre Irini Robinet Jean-Claude Zghondi Jad |
| author_sort | Tyri Danai |
| collection | DOAJ |
| description | Mixtures of crushed excavated COx claystone and bentonite are considered as a potential backfill solution for the French disposal concept of radioactive waste. In the present work, the hydro-mechanical behaviour of claystone/sodium bentonite mixtures was experimentally investigated for various bentonite contents (≤40% in total mass) and densities. Demineralized, site water and cementitious alkaline solution were used. Test on mixtures physicochemical properties showed that Plasticity Index (PI) and Free Swelling Index (FSI) values increase with bentonite content. Introducing bentonite in the mixture induces to lower density for the same compaction energy. No clear impact of the cementitious solution was observed compared to the site water. The expected swelling pressure increase upon bentonite increment was obtained. The effect was more important at higher densities. Mixtures primary wetting, resulted in lower swelling pressure. |
| first_indexed | 2024-04-09T14:52:24Z |
| format | Article |
| id | doaj.art-c114b5f794b54b8caf93fa9f38472527 |
| institution | Directory Open Access Journal |
| issn | 2267-1242 |
| language | English |
| last_indexed | 2024-04-09T14:52:24Z |
| publishDate | 2023-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | E3S Web of Conferences |
| spelling | doaj.art-c114b5f794b54b8caf93fa9f384725272023-05-02T09:28:20ZengEDP SciencesE3S Web of Conferences2267-12422023-01-013821900210.1051/e3sconf/202338219002e3sconf_unsat2023_19002A parametric study on the hydromechanical properties of claystone/bentonite mixturesTyri Danai0Djeran-Maigre Irini1Robinet Jean-Claude2Zghondi Jad3EDAFOS Engineering Consultants S.A.Univ Lyon, INSA LyonEuro-Géomat ConsultingAndra, Meuse/Haute-Marne Underground Research LaboratoryMixtures of crushed excavated COx claystone and bentonite are considered as a potential backfill solution for the French disposal concept of radioactive waste. In the present work, the hydro-mechanical behaviour of claystone/sodium bentonite mixtures was experimentally investigated for various bentonite contents (≤40% in total mass) and densities. Demineralized, site water and cementitious alkaline solution were used. Test on mixtures physicochemical properties showed that Plasticity Index (PI) and Free Swelling Index (FSI) values increase with bentonite content. Introducing bentonite in the mixture induces to lower density for the same compaction energy. No clear impact of the cementitious solution was observed compared to the site water. The expected swelling pressure increase upon bentonite increment was obtained. The effect was more important at higher densities. Mixtures primary wetting, resulted in lower swelling pressure.https://www.e3s-conferences.org/articles/e3sconf/pdf/2023/19/e3sconf_unsat2023_19002.pdf |
| spellingShingle | Tyri Danai Djeran-Maigre Irini Robinet Jean-Claude Zghondi Jad A parametric study on the hydromechanical properties of claystone/bentonite mixtures E3S Web of Conferences |
| title | A parametric study on the hydromechanical properties of claystone/bentonite mixtures |
| title_full | A parametric study on the hydromechanical properties of claystone/bentonite mixtures |
| title_fullStr | A parametric study on the hydromechanical properties of claystone/bentonite mixtures |
| title_full_unstemmed | A parametric study on the hydromechanical properties of claystone/bentonite mixtures |
| title_short | A parametric study on the hydromechanical properties of claystone/bentonite mixtures |
| title_sort | parametric study on the hydromechanical properties of claystone bentonite mixtures |
| url | https://www.e3s-conferences.org/articles/e3sconf/pdf/2023/19/e3sconf_unsat2023_19002.pdf |
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